Improvement in compound steawi-engines



G. B. MASSEY.

COMPOUND STEAM-ENGINE.

Patented Ju1y11.1876.

WITNESSES ATTORNEY N-PETERS'PHOWUTHOGRAPHER, WASHINGTON. DV 0.

GIDEON B. MASSEY, OF NEW YORK, N. Y., ASSIGNOR TO THE MASSEY COMPOUNDENGINE COMPANY, OF SAME PLACE.

IMPROVEMENT IN COMPOUND STEAM-ENGINES.

Specification forming part of Letters Patent No. 179.713, dated July 11,1876; application filed November 13, 1875.

To all whom it may concern:

Be it known that I, GIDEON B. MASSEY, of the city, county, and State ofNew York, have invented anew and Improved .Steam- Engine, of which thefollowing is a specification:

My invention consists of three pistons in one cylinder, two of whichwork together on one crank, and the other works between the first two onanother crank at right angles to the first, together with partscontrived for working the steam between the cylinderheads and the endpistons, and also between the middle piston and the end pistons, in

the cylinder containing pistons 13, and 0 represents the large middleportion containing piston D. The rod E of piston D works through thetubular rod F of pistons B, and

connects with cross-head G and crank H. The pistons B are connectedtogether by rods 1, working through piston D, and their rod F connectswith cross-head J and crank K.

Cranks K and H are arranged at right angles, and steam acts alternatelyon the small and large pistons, so that they pass the centers withoutobstruction.

Steam is admitted at the end ports L into the small parts of thecylinder, and, after pushing pistons B to the end of their stroke, orthereabout, enters .the large part (J, and pushes piston D through itscourse, and exhausts through ports M, thus operating the same as incompound. engines of the ordinary kind, but without back pressure on thesmall.

pistons, which the latter are subject to in the common arrangement.

The valvegear may be arranged in ditt'erent ways, using one or twovalves, or more. In this example the small pistons are represented asrunning out of parts Ainto part 0 to let steam pass on to piston D, inwhich case the packing will, of course, be contrived to retain itsposition; but ports may be made 'to conduct the steam from A to 0without the pistons B passing out of their parts of the cyiinder, theports being uncovered by the pistons at the proper time.

Cylinders A and 0 may he made separate, and be joined by flanges N,bolted together.

The steam admitted at one end portsay the right-hand end port L-may be.exhausted at the let'tliand middle port at; but by keeping that portclosed, and retaining it till crank 11 passes the center, it reacts onright-hand piston B until it gets well back to the cylinder-head again,when it may be exhausted at the righthand port at, thus still furtherexpanding the steam.

The steam acts between the ends of the cylinder and theend pistons whenthe crank ot' the middle piston is passing its centers.

It will he noticed that as soon as the steam passes by the small pistonsto act on the large one the pressure is balanced on the small ones byacting alike on both sides, and thus there is no back pressure on thesmall ones.

Having thus described my invention, I claim as new and' desire to secureby Letters Patent- 1. The combination of a single cylinder, A, connectedend pistons B, and middle piston l) with the driving-shaft having cranksH K K, all arranged substantially as shown, so as to cause the steam topass directly from the small pistons onto the large one Withoutreturning through the ports at the ends of the cylinder, and to permitthe steam to exhaust from the large and small pistons independently, andat different points of the revolution, as described.

2. In a cylinder having two end pistons and a middle one, the two endpistons connected by rods I, working through the middle piston, and therod of the middle piston working through the tubular rod ofthe endpistons, substantially as specified.

GIDEON B. MASSEY. Witnesses: w

A. P. THAYER,

ALEX. F. ROBERTS.

